Interesting fact: Mouse milk is the most expensive milk in the world. Its cost is more than $ 22,000 per liter. To produce one liter of milk, about 4,000 mice are needed. Mouse milk is used in medicine. Females of mice synthesize human protein - lactopherrin, which is used in the production of unique pharmacological preparations. Medications containing mouse milk improve the blood formation process after blood transfusion. Now, if you have mice at home or in the country, you know what to do.